Metals and Non-Metals — Science STD 10 — Question

What would you suggest to a student if while performing an experiment he finds that the pointer/ needle of the ammeter and voltmeter do not coincide with the zero marks on the scales when the circuit is open? No extra ammeter/ voltmeter is available in the laboratory.

Draw ray diagrams showing the image formation by a concave mirror when an object is placed:A little beyond centre of curvature of the mirror.

Describe two anomalies of Mendeleev’s periodic classification of elements.

List two difference functions performed by pancreas in our body.

Name some sources of direct current and some of alternating current.

What do the following symbols used in the topic on heredity represent?

1. TT
2. tt
3. XX
4. XY

List four stakeholders which may be helpful in the conservation of forests.

1. E is the gene for brown eye colour and and e is the gene for blue eye colour. which gene is:

1. Recessive.
2. Dominant.

2. Both father and mother have the genes Ee in their cells. What colour are their eyes?
3. Which combination of genes in the zygote will produce children with blue eyes?
4. Which combination of genes in the zygote will produce children with brown eyes?

State the law which governs the amount of heat produced in a metallic conductor when current is passed through it for a given time. Express this law mathematically.

How is sodium metal extracted? Explain with the help of equation of the reaction involved.